Hottest Questions This Week

2

votes

1

answer

311

views

Why are square planar molecules drawn from the side plane as opposed to the top plane?

bond molecular-structure

answered 2 days ago orthocresol♦ 54.5k

4

votes

1

answer

219

views

Fundamental vibrational modes for QM9 molecules

quantum-chemistry databases

modified Oct 24 at 22:37 orthocresol♦ 54.5k

1

vote

1

answer

110

views

+50

Unsure whether this classification of Volatile Organic Compound and/or Particulate Matter is correct

organic-chemistry environmental-chemistry

answered 2 days ago James Gaidis 7,310

-2

votes

1

answer

59

views

Does helium freeze at absolute zero?

phase noble-gases

modified Oct 25 at 14:52 Oscar Lanzi 25.9k

2

votes

1

answer

43

views

Mechanism of acid-catalyzed Robinson annulation?

organic-chemistry reaction-mechanism carbonyl-compounds alcohols enolate-chemistry

modified yesterday user55119 9,547

1

vote

2

answers

53

views

Why don't proteins form branched polymers?

biochemistry polymers proteins

answered Oct 26 at 20:04 Buck Thorn 13.3k

0

votes

3

answers

68

views

How to balance the reaction between ethanol and chlorine using oxidation number method?

organic-chemistry redox

modified Oct 27 at 7:01 andselisk♦ 30.9k

0

votes

2

answers

49

views

Reaction of phosphorous acid (H3PO3) and potassium hydroxide (KOH)

acid-base

modified Oct 25 at 17:36 Oscar Lanzi 25.9k

2

votes

2

answers

77

views

Calculating change in state function following different paths

thermodynamics enthalpy

modified yesterday theorist 6,759

1

vote

2

answers

59

views

In the DNA backbone, which bonds exactly are considered ester bonds?

bond

modified yesterday Karsten Theis 19.5k

4

votes

1

answer

58

views

Proton NMR splitting in 2-substituted furan

organic-chemistry nmr-spectroscopy heterocyclic-compounds

answered Oct 25 at 22:01 orthocresol♦ 54.5k

-1

votes

1

answer

26

views

What does the number 4-88 mean in “Polyvinylalcohol 4-88”?

nomenclature polymers

modified Oct 25 at 4:43 Nilay Ghosh 17.2k

-1

votes

2

answers

37

views

Are there any “catalysts” that decrease the rate of reaction

experimental-chemistry

answered 18 hours ago Karl 9,708

1

vote

1

answer

46

views

Why trans-1-chloro-4-methylcyclohexane have a higher relative energy than trans-1-chloro-2-methylcyclohexane?

organic-chemistry

modified Oct 26 at 23:03 user55119 9,547

0

votes

3

answers

54

views

A problem regarding solubility and concentration

equilibrium solubility precipitation salt

modified yesterday MaxW 20k

-1

votes

1

answer

42

views

The unit of relative atomic mass

isotope

modified Oct 25 at 22:48 Om Desai 37

3

votes

2

answers

41

views

MO diagram when three orbitals of the same symmetry is allowed to mix

inorganic-chemistry molecular-orbital-theory group-theory

answered 2 hours ago Andrew 5,695

0

votes

1

answer

40

views

Whats the driving force behind simple diffusion? Is it just the count of molecules?

biochemistry diffusion

answered Oct 23 at 17:48 Aryan Beezadhur 685

0

votes

2

answers

40

views

How can we prove the inequality TdS > dU + pdV?

physical-chemistry thermodynamics

modified yesterday andselisk♦ 30.9k

0

votes

3

answers

31

views

why does the gap between the energy levels of a hydrogen atom keep decreasing as we move further and further away from nucleus?

atomic-structure

modified Oct 24 at 16:55 porphyrin 23.5k

1

vote

1

answer

35

views

Raman signal of black matte object

spectroscopy

modified 6 hours ago Jtl 341

2

votes

1

answer

43

views

Meaning of 'constant T and p'

physical-chemistry thermodynamics equation-of-state

answered Oct 25 at 11:22 Chet Miller 9,374

0

votes

1

answer

40

views

Selection of parent carbon chain for IUPAC naming [closed]

organic-chemistry nomenclature alcohols

modified Oct 26 at 17:12 Mathew Mahindaratne 25.9k

-1

votes

1

answer

31

views

Halogens chemical reactions with each other [closed]

halogenation chlorine

modified Oct 24 at 16:23 Maurice 8,616

2

votes

1

answer

38

views

Isn't the change in entropy zero for a reversible process?

thermodynamics

answered Oct 25 at 15:47 dval98 850

-1

votes

0

answers

48

views

In 1,2 dichloro 4 nitro benzene ,through addition substitution reaction why para product comes instead of meta? [closed]

organic-chemistry aromatic-compounds nucleophilic-substitution

modified yesterday lakshman 1

0

votes

1

answer

46

views

Azimuthal Quantum Number

quantum-chemistry hydrogen

modified 21 hours ago porphyrin 23.5k

-1

votes

1

answer

43

views

Why do certain compounds dissolve in oil? Why do some types of compounds dissolve in oil, yet not water? [duplicate]

organic-chemistry bond

modified Oct 26 at 19:54 Anise 9

0

votes

0

answers

43

views

Partial molar volume of binary mixture

physical-chemistry solutions phase

asked Oct 27 at 15:15 poorchemstudent 1

0

votes

0

answers

42

views

Positional isomers of methyl bicyclo[4.4.0]decane [closed]

organic-chemistry isomers

modified yesterday Liang 9

0

votes

1

answer

32

views

Deposition of saturated solution and affect of evaporated water

water solubility solutions concentration

modified Oct 24 at 16:14 Panpaka 3

0

votes

0

answers

41

views

Influence of Vinegar on Tap Water pH [closed]

water ph

modified 2 days ago Poutnik 15.2k

-3

votes

1

answer

40

views

chemical equilibrium(le chatelier's principle)

equilibrium

modified 19 hours ago Karl 9,708

0

votes

1

answer

39

views

Sodium Sulfate or Sodium Carbonate for electrolysis in water

electrochemistry electrolysis hydrolysis electroplating

modified yesterday Maurice 8,616

-1

votes

1

answer

30

views

About covalant bound for molecule : repulsion of electrons?

physical-chemistry bond molecular-orbital-theory theoretical-chemistry valence-bond-theory

modified Oct 24 at 13:04 Poutnik 15.2k

-3

votes

2

answers

38

views

NMR definition and meaning [closed]

nmr-spectroscopy

answered Oct 25 at 15:50 Buttonwood 15.2k

-1

votes

0

answers

38

views

Does aspirin at all react with Ethanol?

organic-chemistry reactivity esters phenols

asked Oct 26 at 12:57 Hans 519

0

votes

1

answer

23

views

Catalyze dehydration of formic acid [closed]

organic-chemistry catalysis

answered Oct 27 at 12:40 Nilay Ghosh 17.2k

0

votes

1

answer

29

views

Does the octet rule only apply to the second and third shell or does it apply further?

orbitals

modified yesterday Jan 58.2k

1

vote

0

answers

37

views

Entropy of a van der Waals' gas

physical-chemistry thermodynamics entropy

modified Oct 25 at 16:32 Felix Yeung 7

0

votes

0

answers

35

views

Equilibrium and Rates of Reaction

equilibrium kinetics

modified Oct 27 at 9:54 latin333 13

0

votes

1

answer

35

views

Cp - Cv for a real gas

thermodynamics

answered 2 days ago Chet Miller 9,374

-1

votes

0

answers

35

views

Why is enthalpy U+PV and not U-PV?

thermodynamics

modified 2 days ago Nikhil Pundir 5

-1

votes

1

answer

21

views

Does potential energy of molecules increase or decrease when covalent bonds are formed or broken? [closed]

thermodynamics

modified yesterday andselisk♦ 30.9k

-2

votes

1

answer

34

views

Carbonic acid in pure water [closed]

acid-base water ph

answered Oct 25 at 16:49 Maurice 8,616

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